The verdant mossy ruins of a Franciscan monastery lie in the remote Sintra hills awaiting exploration.

This Industrial Age architectural and engineering gem helps visitors and residents alike traverse Lisbon, “The City of Seven Hills.”

A 16th century chapel decorated with bones, skulls, and entire bodies hanging from the wall.

This prison on the Maltese island of Gozo is almost 500 years old, and they have the graffiti to prove it.

A cluster of granite granaries perched on stilts.

Explore a traditional Albanian dwelling that pays tribute to the region's rich history.

A naturally beautiful, seemingly bottomless deep blue spring.

Once the fallout shelter of a dictator, this sprawling bunker is now a combined history museum and contemporary art gallery.

Hundreds of thousands of concrete bunkers crowd Albania long after the fall of Communism.

A small island less than half a mile from Venice is a forbidden island with a dark and twisted past.

An eerie, derelict amusement park in Berlin.

This ship offers visitors the chance to spend the night aboard a former floating hospital for fishermen.

In the Monastery of São Vicente resides a gallery devoted to a breathtaking collection of seashells.

Nestled in the mountains of Portugal is a tiny village made almost entirely of schist.

A chunk of the "true cross" is held in this small Portuguese church where modern day exorcisms are said to be common place.

An ancient tomb that still stands in Portugal.

An abandoned tuberculosis hospital said to be haunted by the patients who died within its walls.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Executed in 1401, Exhumed in 1878, Stolen in 2010.

The eccentric midcentury home of a suspected mafia gun-runner.

A new sculpture calls attention to climate change in the centuries-old city it threatens.

Castle and secret tunnel withstood a siege until its owner was killed by the Holy Roman Empire, while sitting on the toilet.

A controversial artwork draws attention to the dark history of Prague's "Suicide Bridge."

A surreal statue honoring Prague's favorite literary son.